Teyleten Robot Pro Micro NRF52840 Development Board Wireless Bluetooth Charging Management Module 2.4GHz 3pcs

Great for hobbyist projects

I use these for DIY meshtastic projects.

Cheap and easy to get started with micro controllers. There's no reset button, you just have to connect RST to GND twice quickly to get it into the bootloader.

This was very difficult to get working with Arduino IDE 2.3.7. This is a community board, not openly supported by Arduino or Nordic's nRF Connect SDK. I tried virtually every clone version I could find but after over a week I finally found the magic ...index.json reference for Arduino IDE's preferences - additional boards list: Community Add on to Adafruit nRF52 by Pierre Constantineau. I don't think I can paste links but you should be able to find it with that clue. Other than it being an enigma for a beginner like me, the board does seem to be very popular. A more experienced maker likely wouldn't have my issues - but this wasn't just a point-n-click wizard type thing to get working.

I figured it out! The Teyleten Robot Pro Micro NRF52840 Development Board doesn’t have a dedicated reset button on the PCB, but it does have a reset pin. I connected the reset pin to GND twice quickly using a pair of metal pliers, and my computer immediately recognized it as a USB drive. To clarify: Plug the board into your computer. Connect GND and RST twice in quick succession. The board should appear automatically. I’m not sure yet if this will allow me to program the device, but it’s very promising. I’ll post updates as I make progress. I hope this helps!

These little boards work well. If programming with Arduino, download the nRFMicro board package from github and select the SuperMini nRF52840 board. Don't forget you have to quickly reset the board twice to put in programming mode. Also might have to burn the bootloader for your environment.

Partially functional. I was able to use serial and uf2 flash. Most of the pins on my board were dysfunctional which is strange, is this a defective chip? I'm guessing these are so cheap because the chips are defective. I have not tested the bluetooth, but with only around 5 GPIO functional (I painstakingly tested the response of every pin as INPUT after filtering out the noise), I'm not in a rush. The pins that were functional were not in their labelled places. Needless to say, this is not even close to a drop in replacement for the nice!nano v2. Nobody else has wrote about their success, just "it turns on". This is not enough to satisfy me. At best I could make a bluetooth toaster out of this... so much for a budget wireless keyboard. If you have the money buy the legit. If you have the skill, test the replicas immediately. Don't be like me assuming the firmware is dysfunctional when it is secretly the hardware. I'm going to commit unalive with my toaster now.

Flashed the firmware to work as watchman dongles. They work well. Haven't had significant issues. Range seems good too for something that doesn't have an external antenna.